Skip the auto shop - Our mechanics make house calls

Q: I replace my ecm cranks once but won't start

asked by on

I replaced my ECM and now it cranks over once but won't start. Then if I was to try and start it for the 2nd time, it won't do anything. Not sure what it could be
My car has an automatic transmission.

A: Hi, thanks for writing in. There are a numb...

Hi, thanks for writing in. There are a number of systems that your ECM controls. Be sure you are getting power to all of your critical components like fuel pump, injectors, coil packs, etc. Check to see if when cranking the car gets fuel. Do this by cranking it and then pulling a spark plug out to see if it is wet with fuel. Next check things like crank and cam sensors as these can cause the car to not produce a spark when not functioning properly as they contribute to proper timing.

If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: After multiple replacement parts, car won't start - 1994 Acura Vigor

There may be an engine position sensor that has failed like a crankshaft position sensor or a cam position sensor inside the distributor. If the computer cannot tell where the engine is in its rotation or how fast its spinning,...

Q: Replaced battery after getting gas in the car. Is it the fuel that keeps the car from starting?

If the vehicle cranks over and does not start after getting fuel then the most common cause is the fuel vapor purge valve is allowing fumes to flow from the fuel tank to the engine while fueling. If purge valve...

Q: Have oil on one of my spark plug wires in the spark plug well the test are fine. What should I do.

Hi there. The issue that you are having is a small o-ring seal on your valve cover is either split or damaged. The valve cover should have a seal all the way around it and 4 o-rings in the middle...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.